Bolted up the springs finally.  New washers fitted and nearside u-bolts trimmed to correct length.  I had to grind a bit of the rivet head away on the bottom leaf to allow the u-bolt saddle to seat against the bottom of the spring without a gap.  All the cotter bolts and nuts are fitted and tight  but the greasers still need to be screwed into the shackle pins.  This series of pictures shows the new springs: